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Ambient temperature and UV-cured hybrid coatings from acetoacetylated non-isocyanate polyurethanes

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Abstract

Preparation of ambient and UV curing non-isocyanate polyurethane (NIPU) coatings has been reported using a series of acetoacetylated non-isocyanate polyurethane (AA-NI-PUPO) oligomers. Synthesized oligomers were characterized using various techniques such as Fourier transform infrared and nuclear magnetic resonance spectroscopy. AA-NI-PUPOs showed significantly lower viscosity compared to their non-acetoacetylated counterparts. Ambient temperature-cured systems were formulated by mixing AA-NI-PUPOs and different primary amine compounds in stoichiometric proportions. Michael addition reaction of acrylates and AA-NI-PUPOs was initiated by UV curing using a photobase generator as the catalyst. NIPU coatings were studied for various thermo-mechanical properties and corrosion resistance. The selected UV-cured and ambient-cured samples showed instant and 1-h tack-free time, respectively. Results revealed that with proper selection of acetoacetylated resin and crosslinker type, coatings with properties comparable to conventional PU coatings could be formulated. Moreover, UV-curable coatings with up to 90 wt% solid could be formulated using conventional monomeric acrylates as a reactive diluent. The study demonstrates the feasibility of formulating solvent-free rapid ambient curing non-isocyanate polyurethane coatings.

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Acknowledgments

The authors would like to gratefully acknowledge financial support from the federal agency—strategic environmental research and development program (SERDP), USA.

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  1. Coating Research Institute (CRI), Eastern Michigan University, 430 West Forest Ave., Ypsilanti, MI, 48197, USA

    H. R. Asemani & V. Mannari

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Asemani, H.R., Mannari, V. Ambient temperature and UV-cured hybrid coatings from acetoacetylated non-isocyanate polyurethanes. J Coat Technol Res 18, 469–488 (2021). https://doi.org/10.1007/s11998-020-00425-1

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